If the Organization-Wide Settings (OWD) in your Salesforce Org is set to anything other than “Public Read/Write” for any of the standard or custom objects then it is more than likely that you will need to setup some sharing rules to share these records with other users. So what are the different ways to share records? Here is a checklist of all the different ways (21 that I could think of) in which you can share records in Salesforce. You can use this as a quick reference guide to help you determine which of these options will be most appropriate to meet your business requirements.
A Mind Mapping Tool is a visual way to organize your thoughts and ideas and is great for brainstorming. You can use a combination of texts, pictures, colors, icons, drawings, videos, and link everything together. 
In simple terms, you will use a CI/CD (stands “Continous Integration” & “Continuous Delivery”) tool in Salesforce to deploy metadata from one org to another org. CI/CD help you deliver configuration & code changes frequently, reliably, and automatically. It also helps you catch errors early in the development process and not right before deployment. 
Here is a list of resources where you are going to find videos on webinars, sessions, tutorials, tips & tricks on Salesforce. This list contains the channels from Salesforce itself and channels from the community
There are two important aspects of testing. Test the new features and functionalities that you are introducing and test the existing features and functionalities to ensure that nothing has broken. Problems and bugs encountered in a live system can quickly shake and erode stakeholder’s confidence resulting in poor adoption and even abandonment.